gas/as.c

   1 /* as.c - GAS main program.
   2    Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   3    1999, 2000, 2001, 2002
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GAS, the GNU Assembler.
   7
   8    GAS is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2, or (at your option)
  11    any later version.
  12
  13    GAS is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GAS; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  21    02111-1307, USA.  */
  22
  23 /* Main program for AS; a 32-bit assembler of GNU.
  24  * Understands command arguments.
  25  * Has a few routines that don't fit in other modules because they
  26  * are shared.
  27  *
  28  *                      bugs
  29  *
  30  * : initialisers
  31  *      Since no-one else says they will support them in future: I
  32  * don't support them now.
  33  */
  34
  35 #include "ansidecl.h"
  36
  37 #define COMMON
  38
  39 #include "as.h"
  40 #include "subsegs.h"
  41 #include "output-file.h"
  42 #include "sb.h"
  43 #include "macro.h"
  44 #include "dwarf2dbg.h"
  45
  46 #ifdef HAVE_ITBL_CPU
  47 #include "itbl-ops.h"
  48 #else
  49 #define itbl_parse(itbl_file) 1
  50 #define itbl_init()
  51 #endif
  52
  53 #ifdef HAVE_SBRK
  54 #ifdef NEED_DECLARATION_SBRK
  55 extern PTR sbrk ();
  56 #endif
  57 #endif
  58
  59 static void show_usage PARAMS ((FILE *));
  60 static void parse_args PARAMS ((int *, char ***));
  61 static void dump_statistics PARAMS ((void));
  62 static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
  63 static int macro_expr PARAMS ((const char *, int, sb *, int *));
  64
  65 /* True if a listing is wanted.  */
  66 int listing;
  67
  68 /* Name of listing file.  */
  69 static char *listing_filename = NULL;
  70
  71 /* Type of debugging to generate.  */
  72
  73 enum debug_info_type debug_type = DEBUG_UNSPECIFIED;
  74
  75 /* Maximum level of macro nesting.  */
  76 int max_macro_nest = 100;
  77
  78 /* argv[0]  */
  79 char *myname;
  80 #ifdef BFD_ASSEMBLER
  81 segT reg_section, expr_section;
  82 segT text_section, data_section, bss_section;
  83 #endif
  84
  85 /* The default obstack chunk size.  If we set this to zero, the
  86    obstack code will use whatever will fit in a 4096 byte block.  */
  87 int chunksize = 0;
  88
  89 /* To monitor memory allocation more effectively, make this non-zero.
  90    Then the chunk sizes for gas and bfd will be reduced.  */
  91 int debug_memory = 0;
  92
  93 /* We build a list of defsyms as we read the options, and then define
  94    them after we have initialized everything.  */
  95
  96 struct defsym_list {
  97   struct defsym_list *next;
  98   char *name;
  99   valueT value;
 100 };
 101
 102 static struct defsym_list *defsyms;
 103
 104 /* Keep a record of the itbl files we read in.  */
 105
 106 struct itbl_file_list {
 107   struct itbl_file_list *next;
 108   char *name;
 109 };
 110
 111 static struct itbl_file_list *itbl_files;
 112 \f
 113 #ifdef USE_EMULATIONS
 114 #define EMULATION_ENVIRON "AS_EMULATION"
 115
 116 extern struct emulation mipsbelf, mipslelf, mipself;
 117 extern struct emulation mipsbecoff, mipslecoff, mipsecoff;
 118 extern struct emulation i386coff, i386elf, i386aout;
 119 extern struct emulation crisaout, criself;
 120
 121 static struct emulation *const emulations[] = { EMULATIONS };
 122 static const int n_emulations = sizeof (emulations) / sizeof (emulations[0]);
 123
 124 static void select_emulation_mode PARAMS ((int, char **));
 125
 126 static void
 127 select_emulation_mode (argc, argv)
 128      int argc;
 129      char **argv;
 130 {
 131   int i;
 132   char *p, *em = 0;
 133
 134   for (i = 1; i < argc; i++)
 135     if (!strncmp ("--em", argv[i], 4))
 136       break;
 137
 138   if (i == argc)
 139     goto do_default;
 140
 141   p = strchr (argv[i], '=');
 142   if (p)
 143     p++;
 144   else
 145     p = argv[i + 1];
 146
 147   if (!p || !*p)
 148     as_fatal (_("missing emulation mode name"));
 149   em = p;
 150
 151  do_default:
 152   if (em == 0)
 153     em = getenv (EMULATION_ENVIRON);
 154   if (em == 0)
 155     em = DEFAULT_EMULATION;
 156
 157   if (em)
 158     {
 159       for (i = 0; i < n_emulations; i++)
 160         if (!strcmp (emulations[i]->name, em))
 161           break;
 162       if (i == n_emulations)
 163         as_fatal (_("unrecognized emulation name `%s'"), em);
 164       this_emulation = emulations[i];
 165     }
 166   else
 167     this_emulation = emulations[0];
 168
 169   this_emulation->init ();
 170 }
 171
 172 const char *
 173 default_emul_bfd_name ()
 174 {
 175   abort ();
 176   return NULL;
 177 }
 178
 179 void
 180 common_emul_init ()
 181 {
 182   this_format = this_emulation->format;
 183
 184   if (this_emulation->leading_underscore == 2)
 185     this_emulation->leading_underscore = this_format->dfl_leading_underscore;
 186
 187   if (this_emulation->default_endian != 2)
 188     target_big_endian = this_emulation->default_endian;
 189
 190   if (this_emulation->fake_label_name == 0)
 191     {
 192       if (this_emulation->leading_underscore)
 193         this_emulation->fake_label_name = "L0\001";
 194       else
 195         /* What other parameters should we test?  */
 196         this_emulation->fake_label_name = ".L0\001";
 197     }
 198 }
 199 #endif
 200
 201 void
 202 print_version_id ()
 203 {
 204   static int printed;
 205   if (printed)
 206     return;
 207   printed = 1;
 208
 209 #ifdef BFD_ASSEMBLER
 210   fprintf (stderr, _("GNU assembler version %s (%s) using BFD version %s"),
 211            VERSION, TARGET_ALIAS, BFD_VERSION_STRING);
 212 #else
 213   fprintf (stderr, _("GNU assembler version %s (%s)"), VERSION, TARGET_ALIAS);
 214 #endif
 215   fprintf (stderr, "\n");
 216 }
 217
 218 static void
 219 show_usage (stream)
 220      FILE *stream;
 221 {
 222   fprintf (stream, _("Usage: %s [option...] [asmfile...]\n"), myname);
 223
 224   fprintf (stream, _("\
 225 Options:\n\
 226   -a[sub-option...]       turn on listings\n\
 227                           Sub-options [default hls]:\n\
 228                           c      omit false conditionals\n\
 229                           d      omit debugging directives\n\
 230                           h      include high-level source\n\
 231                           l      include assembly\n\
 232                           m      include macro expansions\n\
 233                           n      omit forms processing\n\
 234                           s      include symbols\n\
 235                           =FILE  list to FILE (must be last sub-option)\n"));
 236
 237   fprintf (stream, _("\
 238   -D                      produce assembler debugging messages\n"));
 239   fprintf (stream, _("\
 240   --defsym SYM=VAL        define symbol SYM to given value\n"));
 241 #ifdef USE_EMULATIONS
 242   {
 243     int i;
 244     char *def_em;
 245
 246     fprintf (stream, "\
 247   --em=[");
 248     for (i = 0; i < n_emulations - 1; i++)
 249       fprintf (stream, "%s | ", emulations[i]->name);
 250     fprintf (stream, "%s]\n", emulations[i]->name);
 251
 252     def_em = getenv (EMULATION_ENVIRON);
 253     if (!def_em)
 254       def_em = DEFAULT_EMULATION;
 255     fprintf (stream, _("\
 256                           emulate output (default %s)\n"), def_em);
 257   }
 258 #endif
 259   fprintf (stream, _("\
 260   -f                      skip whitespace and comment preprocessing\n"));
 261   fprintf (stream, _("\
 262   --gstabs                generate stabs debugging information\n"));
 263   fprintf (stream, _("\
 264   --gdwarf2               generate DWARF2 debugging information\n"));
 265   fprintf (stream, _("\
 266   --help                  show this message and exit\n"));
 267   fprintf (stream, _("\
 268   --target-help           show target specific options\n"));
 269   fprintf (stream, _("\
 270   -I DIR                  add DIR to search list for .include directives\n"));
 271   fprintf (stream, _("\
 272   -J                      don't warn about signed overflow\n"));
 273   fprintf (stream, _("\
 274   -K                      warn when differences altered for long displacements\n"));
 275   fprintf (stream, _("\
 276   -L,--keep-locals        keep local symbols (e.g. starting with `L')\n"));
 277   fprintf (stream, _("\
 278   -M,--mri                assemble in MRI compatibility mode\n"));
 279   fprintf (stream, _("\
 280   --MD FILE               write dependency information in FILE (default none)\n"));
 281   fprintf (stream, _("\
 282   -nocpp                  ignored\n"));
 283   fprintf (stream, _("\
 284   -o OBJFILE              name the object-file output OBJFILE (default a.out)\n"));
 285   fprintf (stream, _("\
 286   -R                      fold data section into text section\n"));
 287   fprintf (stream, _("\
 288   --statistics            print various measured statistics from execution\n"));
 289   fprintf (stream, _("\
 290   --strip-local-absolute  strip local absolute symbols\n"));
 291   fprintf (stream, _("\
 292   --traditional-format    Use same format as native assembler when possible\n"));
 293   fprintf (stream, _("\
 294   --version               print assembler version number and exit\n"));
 295   fprintf (stream, _("\
 296   -W  --no-warn           suppress warnings\n"));
 297   fprintf (stream, _("\
 298   --warn                  don't suppress warnings\n"));
 299   fprintf (stream, _("\
 300   --fatal-warnings        treat warnings as errors\n"));
 301   fprintf (stream, _("\
 302   --itbl INSTTBL          extend instruction set to include instructions\n\
 303                           matching the specifications defined in file INSTTBL\n"));
 304   fprintf (stream, _("\
 305   -w                      ignored\n"));
 306   fprintf (stream, _("\
 307   -X                      ignored\n"));
 308   fprintf (stream, _("\
 309   -Z                      generate object file even after errors\n"));
 310   fprintf (stream, _("\
 311   --listing-lhs-width     set the width in words of the output data column of\n\
 312                           the listing\n"));
 313   fprintf (stream, _("\
 314   --listing-lhs-width2    set the width in words of the continuation lines\n\
 315                           of the output data column; ignored if smaller than\n\
 316                           the width of the first line\n"));
 317   fprintf (stream, _("\
 318   --listing-rhs-width     set the max width in characters of the lines from\n\
 319                           the source file\n"));
 320   fprintf (stream, _("\
 321   --listing-cont-lines    set the maximum number of continuation lines used\n\
 322                           for the output data column of the listing\n"));
 323
 324   md_show_usage (stream);
 325
 326   fputc ('\n', stream);
 327   fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
 328 }
 329
 330 /* Since it is easy to do here we interpret the special arg "-"
 331    to mean "use stdin" and we set that argv[] pointing to "".
 332    After we have munged argv[], the only things left are source file
 333    name(s) and ""(s) denoting stdin. These file names are used
 334    (perhaps more than once) later.
 335
 336    check for new machine-dep cmdline options in
 337    md_parse_option definitions in config/tc-*.c.  */
 338
 339 static void
 340 parse_args (pargc, pargv)
 341      int *pargc;
 342      char ***pargv;
 343 {
 344   int old_argc, new_argc;
 345   char **old_argv, **new_argv;
 346
 347   /* Starting the short option string with '-' is for programs that
 348      expect options and other ARGV-elements in any order and that care about
 349      the ordering of the two.  We describe each non-option ARGV-element
 350      as if it were the argument of an option with character code 1.  */
 351
 352   char *shortopts;
 353   extern const char *md_shortopts;
 354   static const char std_shortopts[] = {
 355     '-', 'J',
 356 #ifndef WORKING_DOT_WORD
 357     /* -K is not meaningful if .word is not being hacked.  */
 358     'K',
 359 #endif
 360     'L', 'M', 'R', 'W', 'Z', 'f', 'a', ':', ':', 'D', 'I', ':', 'o', ':',
 361 #ifndef VMS
 362     /* -v takes an argument on VMS, so we don't make it a generic
 363        option.  */
 364     'v',
 365 #endif
 366     'w', 'X',
 367     /* New option for extending instruction set (see also --itbl below)  */
 368     't', ':',
 369     '\0'
 370   };
 371   struct option *longopts;
 372   extern struct option md_longopts[];
 373   extern size_t md_longopts_size;
 374   static const struct option std_longopts[] = {
 375 #define OPTION_HELP (OPTION_STD_BASE)
 376     {"help", no_argument, NULL, OPTION_HELP},
 377     {"keep-locals", no_argument, NULL, 'L'},
 378     {"mri", no_argument, NULL, 'M'},
 379 #define OPTION_NOCPP (OPTION_STD_BASE + 1)
 380     {"nocpp", no_argument, NULL, OPTION_NOCPP},
 381 #define OPTION_STATISTICS (OPTION_STD_BASE + 2)
 382     {"statistics", no_argument, NULL, OPTION_STATISTICS},
 383 #define OPTION_VERSION (OPTION_STD_BASE + 3)
 384     {"version", no_argument, NULL, OPTION_VERSION},
 385 #define OPTION_DUMPCONFIG (OPTION_STD_BASE + 4)
 386     {"dump-config", no_argument, NULL, OPTION_DUMPCONFIG},
 387 #define OPTION_VERBOSE (OPTION_STD_BASE + 5)
 388     {"verbose", no_argument, NULL, OPTION_VERBOSE},
 389 #define OPTION_EMULATION (OPTION_STD_BASE + 6)
 390     {"emulation", required_argument, NULL, OPTION_EMULATION},
 391 #define OPTION_DEFSYM (OPTION_STD_BASE + 7)
 392     {"defsym", required_argument, NULL, OPTION_DEFSYM},
 393 #define OPTION_INSTTBL (OPTION_STD_BASE + 8)
 394     /* New option for extending instruction set (see also -t above).
 395        The "-t file" or "--itbl file" option extends the basic set of
 396        valid instructions by reading "file", a text file containing a
 397        list of instruction formats.  The additional opcodes and their
 398        formats are added to the built-in set of instructions, and
 399        mnemonics for new registers may also be defined.  */
 400     {"itbl", required_argument, NULL, OPTION_INSTTBL},
 401 #define OPTION_LISTING_LHS_WIDTH (OPTION_STD_BASE + 9)
 402     {"listing-lhs-width", required_argument, NULL, OPTION_LISTING_LHS_WIDTH},
 403 #define OPTION_LISTING_LHS_WIDTH2 (OPTION_STD_BASE + 10)
 404     {"listing-lhs-width2", required_argument, NULL, OPTION_LISTING_LHS_WIDTH2},
 405 #define OPTION_LISTING_RHS_WIDTH (OPTION_STD_BASE + 11)
 406     {"listing-rhs-width", required_argument, NULL, OPTION_LISTING_RHS_WIDTH},
 407 #define OPTION_LISTING_CONT_LINES (OPTION_STD_BASE + 12)
 408     {"listing-cont-lines", required_argument, NULL, OPTION_LISTING_CONT_LINES},
 409 #define OPTION_DEPFILE (OPTION_STD_BASE + 13)
 410     {"MD", required_argument, NULL, OPTION_DEPFILE},
 411 #define OPTION_GSTABS (OPTION_STD_BASE + 14)
 412     {"gstabs", no_argument, NULL, OPTION_GSTABS},
 413 #define OPTION_STRIP_LOCAL_ABSOLUTE (OPTION_STD_BASE + 15)
 414     {"strip-local-absolute", no_argument, NULL, OPTION_STRIP_LOCAL_ABSOLUTE},
 415 #define OPTION_TRADITIONAL_FORMAT (OPTION_STD_BASE + 16)
 416     {"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT},
 417 #define OPTION_GDWARF2 (OPTION_STD_BASE + 17)
 418     {"gdwarf2", no_argument, NULL, OPTION_GDWARF2},
 419     {"no-warn", no_argument, NULL, 'W'},
 420 #define OPTION_WARN (OPTION_STD_BASE + 18)
 421     {"warn", no_argument, NULL, OPTION_WARN},
 422 #define OPTION_TARGET_HELP (OPTION_STD_BASE + 19)
 423     {"target-help", no_argument, NULL, OPTION_TARGET_HELP},
 424 #define OPTION_WARN_FATAL (OPTION_STD_BASE + 20)
 425     {"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL}
 426     /* When you add options here, check that they do not collide with
 427        OPTION_MD_BASE.  See as.h.  */
 428   };
 429
 430   /* Construct the option lists from the standard list and the target
 431      dependent list.  Include space for an extra NULL option and
 432      always NULL terminate.  */
 433   shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
 434   longopts = (struct option *) xmalloc (sizeof (std_longopts)
 435                                         + md_longopts_size
 436                                         + sizeof (struct option));
 437   memcpy (longopts, std_longopts, sizeof (std_longopts));
 438   memcpy ((char *) longopts + sizeof (std_longopts),
 439           md_longopts, md_longopts_size);
 440   memset ((char *) longopts + sizeof (std_longopts) + md_longopts_size,
 441           0, sizeof (struct option));
 442
 443   /* Make a local copy of the old argv.  */
 444   old_argc = *pargc;
 445   old_argv = *pargv;
 446
 447   /* Initialize a new argv that contains no options.  */
 448   new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
 449   new_argv[0] = old_argv[0];
 450   new_argc = 1;
 451   new_argv[new_argc] = NULL;
 452
 453   while (1)
 454     {
 455       /* getopt_long_only is like getopt_long, but '-' as well as '--' can
 456          indicate a long option.  */
 457       int longind;
 458       int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
 459                                    &longind);
 460
 461       if (optc == -1)
 462         break;
 463
 464       switch (optc)
 465         {
 466         default:
 467           /* md_parse_option should return 1 if it recognizes optc,
 468              0 if not.  */
 469           if (md_parse_option (optc, optarg) != 0)
 470             break;
 471           /* `-v' isn't included in the general short_opts list, so check for
 472              it explicity here before deciding we've gotten a bad argument.  */
 473           if (optc == 'v')
 474             {
 475 #ifdef VMS
 476               /* Telling getopt to treat -v's value as optional can result
 477                  in it picking up a following filename argument here.  The
 478                  VMS code in md_parse_option can return 0 in that case,
 479                  but it has no way of pushing the filename argument back.  */
 480               if (optarg && *optarg)
 481                 new_argv[new_argc++] = optarg, new_argv[new_argc] = NULL;
 482               else
 483 #else
 484               case 'v':
 485 #endif
 486               case OPTION_VERBOSE:
 487                 print_version_id ();
 488               break;
 489             }
 490           /* Fall through.  */
 491
 492         case '?':
 493           exit (EXIT_FAILURE);
 494
 495         case 1:                 /* File name.  */
 496           if (!strcmp (optarg, "-"))
 497             optarg = "";
 498           new_argv[new_argc++] = optarg;
 499           new_argv[new_argc] = NULL;
 500           break;
 501
 502         case OPTION_TARGET_HELP:
 503           md_show_usage (stdout);
 504           exit (EXIT_SUCCESS);
 505
 506         case OPTION_HELP:
 507           show_usage (stdout);
 508           exit (EXIT_SUCCESS);
 509
 510         case OPTION_NOCPP:
 511           break;
 512
 513         case OPTION_STATISTICS:
 514           flag_print_statistics = 1;
 515           break;
 516
 517         case OPTION_STRIP_LOCAL_ABSOLUTE:
 518           flag_strip_local_absolute = 1;
 519           break;
 520
 521         case OPTION_TRADITIONAL_FORMAT:
 522           flag_traditional_format = 1;
 523           break;
 524
 525         case OPTION_VERSION:
 526           /* This output is intended to follow the GNU standards document.  */
 527 #ifdef BFD_ASSEMBLER
 528           printf (_("GNU assembler %s\n"), BFD_VERSION_STRING);
 529 #else
 530           printf (_("GNU assembler %s\n"), VERSION);
 531 #endif
 532           printf (_("Copyright 2002 Free Software Foundation, Inc.\n"));
 533           printf (_("\
 534 This program is free software; you may redistribute it under the terms of\n\
 535 the GNU General Public License.  This program has absolutely no warranty.\n"));
 536           printf (_("This assembler was configured for a target of `%s'.\n"),
 537                   TARGET_ALIAS);
 538           exit (EXIT_SUCCESS);
 539
 540         case OPTION_EMULATION:
 541 #ifdef USE_EMULATIONS
 542           if (strcmp (optarg, this_emulation->name))
 543             as_fatal (_("multiple emulation names specified"));
 544 #else
 545           as_fatal (_("emulations not handled in this configuration"));
 546 #endif
 547           break;
 548
 549         case OPTION_DUMPCONFIG:
 550           fprintf (stderr, _("alias = %s\n"), TARGET_ALIAS);
 551           fprintf (stderr, _("canonical = %s\n"), TARGET_CANONICAL);
 552           fprintf (stderr, _("cpu-type = %s\n"), TARGET_CPU);
 553 #ifdef TARGET_OBJ_FORMAT
 554           fprintf (stderr, _("format = %s\n"), TARGET_OBJ_FORMAT);
 555 #endif
 556 #ifdef TARGET_FORMAT
 557           fprintf (stderr, _("bfd-target = %s\n"), TARGET_FORMAT);
 558 #endif
 559           exit (EXIT_SUCCESS);
 560
 561         case OPTION_DEFSYM:
 562           {
 563             char *s;
 564             valueT i;
 565             struct defsym_list *n;
 566
 567             for (s = optarg; *s != '\0' && *s != '='; s++)
 568               ;
 569             if (*s == '\0')
 570               as_fatal (_("bad defsym; format is --defsym name=value"));
 571             *s++ = '\0';
 572 #ifdef BFD_ASSEMBLER
 573             i = bfd_scan_vma (s, (const char **) NULL, 0);
 574 #else
 575             i = strtol (s, (char **) NULL, 0);
 576 #endif
 577             n = (struct defsym_list *) xmalloc (sizeof *n);
 578             n->next = defsyms;
 579             n->name = optarg;
 580             n->value = i;
 581             defsyms = n;
 582           }
 583           break;
 584
 585         case OPTION_INSTTBL:
 586         case 't':
 587           {
 588             /* optarg is the name of the file containing the instruction
 589                formats, opcodes, register names, etc.  */
 590             struct itbl_file_list *n;
 591
 592             if (optarg == NULL)
 593               {
 594                 as_warn (_("no file name following -t option"));
 595                 break;
 596               }
 597
 598             n = (struct itbl_file_list *) xmalloc (sizeof *n);
 599             n->next = itbl_files;
 600             n->name = optarg;
 601             itbl_files = n;
 602
 603             /* Parse the file and add the new instructions to our internal
 604                table.  If multiple instruction tables are specified, the
 605                information from this table gets appended onto the existing
 606                internal table.  */
 607             itbl_files->name = xstrdup (optarg);
 608             if (itbl_parse (itbl_files->name) != 0)
 609               as_fatal (_("failed to read instruction table %s\n"),
 610                         itbl_files->name);
 611           }
 612           break;
 613
 614         case OPTION_DEPFILE:
 615           start_dependencies (optarg);
 616           break;
 617
 618         case OPTION_GSTABS:
 619           debug_type = DEBUG_STABS;
 620           break;
 621
 622         case OPTION_GDWARF2:
 623           debug_type = DEBUG_DWARF2;
 624           break;
 625
 626         case 'J':
 627           flag_signed_overflow_ok = 1;
 628           break;
 629
 630 #ifndef WORKING_DOT_WORD
 631         case 'K':
 632           flag_warn_displacement = 1;
 633           break;
 634 #endif
 635
 636         case 'L':
 637           flag_keep_locals = 1;
 638           break;
 639
 640         case OPTION_LISTING_LHS_WIDTH:
 641           listing_lhs_width = atoi (optarg);
 642           if (listing_lhs_width_second < listing_lhs_width)
 643             listing_lhs_width_second = listing_lhs_width;
 644           break;
 645         case OPTION_LISTING_LHS_WIDTH2:
 646           {
 647             int tmp = atoi (optarg);
 648             if (tmp > listing_lhs_width)
 649               listing_lhs_width_second = tmp;
 650           }
 651           break;
 652         case OPTION_LISTING_RHS_WIDTH:
 653           listing_rhs_width = atoi (optarg);
 654           break;
 655         case OPTION_LISTING_CONT_LINES:
 656           listing_lhs_cont_lines = atoi (optarg);
 657           break;
 658
 659         case 'M':
 660           flag_mri = 1;
 661 #ifdef TC_M68K
 662           flag_m68k_mri = 1;
 663 #endif
 664           break;
 665
 666         case 'R':
 667           flag_readonly_data_in_text = 1;
 668           break;
 669
 670         case 'W':
 671           flag_no_warnings = 1;
 672           break;
 673
 674         case OPTION_WARN:
 675           flag_no_warnings = 0;
 676           flag_fatal_warnings = 0;
 677           break;
 678
 679         case OPTION_WARN_FATAL:
 680           flag_no_warnings = 0;
 681           flag_fatal_warnings = 1;
 682           break;
 683
 684         case 'Z':
 685           flag_always_generate_output = 1;
 686           break;
 687
 688         case 'a':
 689           if (optarg)
 690             {
 691               if (md_parse_option (optc, optarg) != 0)
 692                 break;
 693
 694               while (*optarg)
 695                 {
 696                   switch (*optarg)
 697                     {
 698                     case 'c':
 699                       listing |= LISTING_NOCOND;
 700                       break;
 701                     case 'd':
 702                       listing |= LISTING_NODEBUG;
 703                       break;
 704                     case 'h':
 705                       listing |= LISTING_HLL;
 706                       break;
 707                     case 'l':
 708                       listing |= LISTING_LISTING;
 709                       break;
 710                     case 'm':
 711                       listing |= LISTING_MACEXP;
 712                       break;
 713                     case 'n':
 714                       listing |= LISTING_NOFORM;
 715                       break;
 716                     case 's':
 717                       listing |= LISTING_SYMBOLS;
 718                       break;
 719                     case '=':
 720                       listing_filename = xstrdup (optarg + 1);
 721                       optarg += strlen (listing_filename);
 722                       break;
 723                     default:
 724                       as_fatal (_("invalid listing option `%c'"), *optarg);
 725                       break;
 726                     }
 727                   optarg++;
 728                 }
 729             }
 730           if (!listing)
 731             listing = LISTING_DEFAULT;
 732           break;
 733
 734         case 'D':
 735           /* DEBUG is implemented: it debugs different
 736              things from other people's assemblers.  */
 737           flag_debug = 1;
 738           break;
 739
 740         case 'f':
 741           flag_no_comments = 1;
 742           break;
 743
 744         case 'I':
 745           {                     /* Include file directory.  */
 746             char *temp = xstrdup (optarg);
 747             add_include_dir (temp);
 748             break;
 749           }
 750
 751         case 'o':
 752           out_file_name = xstrdup (optarg);
 753           break;
 754
 755         case 'w':
 756           break;
 757
 758         case 'X':
 759           /* -X means treat warnings as errors.  */
 760           break;
 761         }
 762     }
 763
 764   free (shortopts);
 765   free (longopts);
 766
 767   *pargc = new_argc;
 768   *pargv = new_argv;
 769
 770 #ifdef md_after_parse_args
 771   md_after_parse_args ();
 772 #endif
 773 }
 774
 775 static long start_time;
 776
 777 int main PARAMS ((int, char **));
 778
 779 int
 780 main (argc, argv)
 781      int argc;
 782      char **argv;
 783 {
 784   int macro_alternate;
 785   int macro_strip_at;
 786   int keep_it;
 787
 788   start_time = get_run_time ();
 789
 790 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
 791   setlocale (LC_MESSAGES, "");
 792 #endif
 793 #if defined (HAVE_SETLOCALE)
 794   setlocale (LC_CTYPE, "");
 795 #endif
 796   bindtextdomain (PACKAGE, LOCALEDIR);
 797   textdomain (PACKAGE);
 798
 799   if (debug_memory)
 800     chunksize = 64;
 801
 802 #ifdef HOST_SPECIAL_INIT
 803   HOST_SPECIAL_INIT (argc, argv);
 804 #endif
 805
 806   myname = argv[0];
 807   xmalloc_set_program_name (myname);
 808
 809   START_PROGRESS (myname, 0);
 810
 811 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
 812 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
 813 #endif
 814
 815   out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
 816
 817   hex_init ();
 818 #ifdef BFD_ASSEMBLER
 819   bfd_init ();
 820   bfd_set_error_program_name (myname);
 821 #endif
 822
 823 #ifdef USE_EMULATIONS
 824   select_emulation_mode (argc, argv);
 825 #endif
 826
 827   PROGRESS (1);
 828   symbol_begin ();
 829   frag_init ();
 830   subsegs_begin ();
 831   parse_args (&argc, &argv);
 832   read_begin ();
 833   input_scrub_begin ();
 834   expr_begin ();
 835
 836   if (flag_print_statistics)
 837     xatexit (dump_statistics);
 838
 839   macro_alternate = 0;
 840   macro_strip_at = 0;
 841 #ifdef TC_I960
 842   macro_strip_at = flag_mri;
 843 #endif
 844 #ifdef TC_A29K
 845   /* For compatibility with the AMD 29K family macro assembler
 846      specification.  */
 847   macro_alternate = 1;
 848   macro_strip_at = 1;
 849 #endif
 850
 851   macro_init (macro_alternate, flag_mri, macro_strip_at, macro_expr);
 852
 853   PROGRESS (1);
 854
 855 #ifdef BFD_ASSEMBLER
 856   output_file_create (out_file_name);
 857   assert (stdoutput != 0);
 858 #endif
 859
 860 #ifdef tc_init_after_args
 861   tc_init_after_args ();
 862 #endif
 863
 864   itbl_init ();
 865
 866   /* Now that we have fully initialized, and have created the output
 867      file, define any symbols requested by --defsym command line
 868      arguments.  */
 869   while (defsyms != NULL)
 870     {
 871       symbolS *sym;
 872       struct defsym_list *next;
 873
 874       sym = symbol_new (defsyms->name, absolute_section, defsyms->value,
 875                         &zero_address_frag);
 876       symbol_table_insert (sym);
 877       next = defsyms->next;
 878       free (defsyms);
 879       defsyms = next;
 880     }
 881
 882   PROGRESS (1);
 883
 884   /* Assemble it.  */
 885   perform_an_assembly_pass (argc, argv);
 886
 887   cond_finish_check (-1);
 888
 889 #ifdef md_end
 890   md_end ();
 891 #endif
 892
 893   /* If we've been collecting dwarf2 .debug_line info, either for
 894      assembly debugging or on behalf of the compiler, emit it now.  */
 895   dwarf2_finish ();
 896
 897   if (seen_at_least_1_file ()
 898       && (flag_always_generate_output || had_errors () == 0))
 899     keep_it = 1;
 900   else
 901     keep_it = 0;
 902
 903 #if defined (BFD_ASSEMBLER) || !defined (BFD)
 904   /* This used to be done at the start of write_object_file in
 905      write.c, but that caused problems when doing listings when
 906      keep_it was zero.  This could probably be moved above md_end, but
 907      I didn't want to risk the change.  */
 908   subsegs_finish ();
 909 #endif
 910
 911   if (keep_it)
 912     write_object_file ();
 913
 914 #ifndef NO_LISTING
 915   listing_print (listing_filename);
 916 #endif
 917
 918 #ifndef OBJ_VMS /* does its own file handling */
 919 #ifndef BFD_ASSEMBLER
 920   if (keep_it)
 921 #endif
 922     output_file_close (out_file_name);
 923 #endif
 924
 925   if (flag_fatal_warnings && had_warnings () > 0 && had_errors () == 0)
 926     as_bad (_("%d warnings, treating warnings as errors"), had_warnings ());
 927
 928   if (had_errors () > 0 && ! flag_always_generate_output)
 929     keep_it = 0;
 930
 931   if (!keep_it)
 932     unlink (out_file_name);
 933
 934   input_scrub_end ();
 935
 936   END_PROGRESS (myname);
 937
 938   /* Use xexit instead of return, because under VMS environments they
 939      may not place the same interpretation on the value given.  */
 940   if (had_errors () > 0)
 941     xexit (EXIT_FAILURE);
 942
 943   /* Only generate dependency file if assembler was successful.  */
 944   print_dependencies ();
 945
 946   xexit (EXIT_SUCCESS);
 947 }
 948
 949 static void
 950 dump_statistics ()
 951 {
 952 #ifdef HAVE_SBRK
 953   char *lim = (char *) sbrk (0);
 954 #endif
 955   long run_time = get_run_time () - start_time;
 956
 957   fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"),
 958            myname, run_time / 1000000, run_time % 1000000);
 959 #ifdef HAVE_SBRK
 960   fprintf (stderr, _("%s: data size %ld\n"),
 961            myname, (long) (lim - (char *) &environ));
 962 #endif
 963
 964   subsegs_print_statistics (stderr);
 965   write_print_statistics (stderr);
 966   symbol_print_statistics (stderr);
 967   read_print_statistics (stderr);
 968
 969 #ifdef tc_print_statistics
 970   tc_print_statistics (stderr);
 971 #endif
 972 #ifdef obj_print_statistics
 973   obj_print_statistics (stderr);
 974 #endif
 975 }
 976 \f
 977 /* Here to attempt 1 pass over each input file.
 978    We scan argv[*] looking for filenames or exactly "" which is
 979    shorthand for stdin. Any argv that is NULL is not a file-name.
 980    We set need_pass_2 TRUE if, after this, we still have unresolved
 981    expressions of the form (unknown value)+-(unknown value).
 982
 983    Note the un*x semantics: there is only 1 logical input file, but it
 984    may be a catenation of many 'physical' input files.  */
 985
 986 static void
 987 perform_an_assembly_pass (argc, argv)
 988      int argc;
 989      char **argv;
 990 {
 991   int saw_a_file = 0;
 992 #ifdef BFD_ASSEMBLER
 993   flagword applicable;
 994 #endif
 995
 996   need_pass_2 = 0;
 997
 998 #ifndef BFD_ASSEMBLER
 999 #ifdef MANY_SEGMENTS
1000   {
1001     unsigned int i;
1002     for (i = SEG_E0; i < SEG_UNKNOWN; i++)
1003       segment_info[i].fix_root = 0;
1004   }
1005   /* Create the three fixed ones.  */
1006   {
1007     segT seg;
1008
1009 #ifdef TE_APOLLO
1010     seg = subseg_new (".wtext", 0);
1011 #else
1012     seg = subseg_new (".text", 0);
1013 #endif
1014     assert (seg == SEG_E0);
1015     seg = subseg_new (".data", 0);
1016     assert (seg == SEG_E1);
1017     seg = subseg_new (".bss", 0);
1018     assert (seg == SEG_E2);
1019 #ifdef TE_APOLLO
1020     create_target_segments ();
1021 #endif
1022   }
1023
1024 #else /* not MANY_SEGMENTS */
1025   text_fix_root = NULL;
1026   data_fix_root = NULL;
1027   bss_fix_root = NULL;
1028 #endif /* not MANY_SEGMENTS */
1029 #else /* BFD_ASSEMBLER */
1030   /* Create the standard sections, and those the assembler uses
1031      internally.  */
1032   text_section = subseg_new (TEXT_SECTION_NAME, 0);
1033   data_section = subseg_new (DATA_SECTION_NAME, 0);
1034   bss_section = subseg_new (BSS_SECTION_NAME, 0);
1035   /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
1036      to have relocs, otherwise we don't find out in time.  */
1037   applicable = bfd_applicable_section_flags (stdoutput);
1038   bfd_set_section_flags (stdoutput, text_section,
1039                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1040                                        | SEC_CODE | SEC_READONLY));
1041   bfd_set_section_flags (stdoutput, data_section,
1042                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1043                                        | SEC_DATA));
1044   bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
1045   seg_info (bss_section)->bss = 1;
1046   subseg_new (BFD_ABS_SECTION_NAME, 0);
1047   subseg_new (BFD_UND_SECTION_NAME, 0);
1048   reg_section = subseg_new ("*GAS `reg' section*", 0);
1049   expr_section = subseg_new ("*GAS `expr' section*", 0);
1050
1051 #endif /* BFD_ASSEMBLER */
1052
1053   subseg_set (text_section, 0);
1054
1055   /* This may add symbol table entries, which requires having an open BFD,
1056      and sections already created, in BFD_ASSEMBLER mode.  */
1057   md_begin ();
1058
1059 #ifdef obj_begin
1060   obj_begin ();
1061 #endif
1062
1063   /* Skip argv[0].  */
1064   argv++;
1065   argc--;
1066
1067   while (argc--)
1068     {
1069       if (*argv)
1070         {                       /* Is it a file-name argument?  */
1071           PROGRESS (1);
1072           saw_a_file++;
1073           /* argv->"" if stdin desired, else->filename  */
1074           read_a_source_file (*argv);
1075         }
1076       argv++;                   /* completed that argv  */
1077     }
1078   if (!saw_a_file)
1079     read_a_source_file ("");
1080 }
1081
1082 /* The interface between the macro code and gas expression handling.  */
1083
1084 static int
1085 macro_expr (emsg, idx, in, val)
1086      const char *emsg;
1087      int idx;
1088      sb *in;
1089      int *val;
1090 {
1091   char *hold;
1092   expressionS ex;
1093
1094   sb_terminate (in);
1095
1096   hold = input_line_pointer;
1097   input_line_pointer = in->ptr + idx;
1098   expression (&ex);
1099   idx = input_line_pointer - in->ptr;
1100   input_line_pointer = hold;
1101
1102   if (ex.X_op != O_constant)
1103     as_bad ("%s", emsg);
1104
1105   *val = (int) ex.X_add_number;
1106
1107   return idx;
1108 }